1 /* 2 * Authenc: Simple AEAD wrapper for IPsec 3 * 4 * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the Free 8 * Software Foundation; either version 2 of the License, or (at your option) 9 * any later version. 10 * 11 */ 12 13 #include <crypto/internal/aead.h> 14 #include <crypto/internal/hash.h> 15 #include <crypto/internal/skcipher.h> 16 #include <crypto/authenc.h> 17 #include <crypto/scatterwalk.h> 18 #include <linux/err.h> 19 #include <linux/init.h> 20 #include <linux/kernel.h> 21 #include <linux/module.h> 22 #include <linux/rtnetlink.h> 23 #include <linux/slab.h> 24 #include <linux/spinlock.h> 25 26 typedef u8 *(*authenc_ahash_t)(struct aead_request *req, unsigned int flags); 27 28 struct authenc_instance_ctx { 29 struct crypto_ahash_spawn auth; 30 struct crypto_skcipher_spawn enc; 31 }; 32 33 struct crypto_authenc_ctx { 34 unsigned int reqoff; 35 struct crypto_ahash *auth; 36 struct crypto_ablkcipher *enc; 37 }; 38 39 struct authenc_request_ctx { 40 unsigned int cryptlen; 41 struct scatterlist *sg; 42 struct scatterlist asg[2]; 43 struct scatterlist cipher[2]; 44 crypto_completion_t complete; 45 crypto_completion_t update_complete; 46 char tail[]; 47 }; 48 49 static void authenc_request_complete(struct aead_request *req, int err) 50 { 51 if (err != -EINPROGRESS) 52 aead_request_complete(req, err); 53 } 54 55 int crypto_authenc_extractkeys(struct crypto_authenc_keys *keys, const u8 *key, 56 unsigned int keylen) 57 { 58 struct rtattr *rta = (struct rtattr *)key; 59 struct crypto_authenc_key_param *param; 60 61 if (!RTA_OK(rta, keylen)) 62 return -EINVAL; 63 if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM) 64 return -EINVAL; 65 if (RTA_PAYLOAD(rta) < sizeof(*param)) 66 return -EINVAL; 67 68 param = RTA_DATA(rta); 69 keys->enckeylen = be32_to_cpu(param->enckeylen); 70 71 key += RTA_ALIGN(rta->rta_len); 72 keylen -= RTA_ALIGN(rta->rta_len); 73 74 if (keylen < keys->enckeylen) 75 return -EINVAL; 76 77 keys->authkeylen = keylen - keys->enckeylen; 78 keys->authkey = key; 79 keys->enckey = key + keys->authkeylen; 80 81 return 0; 82 } 83 EXPORT_SYMBOL_GPL(crypto_authenc_extractkeys); 84 85 static int crypto_authenc_setkey(struct crypto_aead *authenc, const u8 *key, 86 unsigned int keylen) 87 { 88 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); 89 struct crypto_ahash *auth = ctx->auth; 90 struct crypto_ablkcipher *enc = ctx->enc; 91 struct crypto_authenc_keys keys; 92 int err = -EINVAL; 93 94 if (crypto_authenc_extractkeys(&keys, key, keylen) != 0) 95 goto badkey; 96 97 crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK); 98 crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc) & 99 CRYPTO_TFM_REQ_MASK); 100 err = crypto_ahash_setkey(auth, keys.authkey, keys.authkeylen); 101 crypto_aead_set_flags(authenc, crypto_ahash_get_flags(auth) & 102 CRYPTO_TFM_RES_MASK); 103 104 if (err) 105 goto out; 106 107 crypto_ablkcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK); 108 crypto_ablkcipher_set_flags(enc, crypto_aead_get_flags(authenc) & 109 CRYPTO_TFM_REQ_MASK); 110 err = crypto_ablkcipher_setkey(enc, keys.enckey, keys.enckeylen); 111 crypto_aead_set_flags(authenc, crypto_ablkcipher_get_flags(enc) & 112 CRYPTO_TFM_RES_MASK); 113 114 out: 115 return err; 116 117 badkey: 118 crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN); 119 goto out; 120 } 121 122 static void authenc_geniv_ahash_update_done(struct crypto_async_request *areq, 123 int err) 124 { 125 struct aead_request *req = areq->data; 126 struct crypto_aead *authenc = crypto_aead_reqtfm(req); 127 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); 128 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); 129 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); 130 131 if (err) 132 goto out; 133 134 ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result, 135 areq_ctx->cryptlen); 136 ahash_request_set_callback(ahreq, aead_request_flags(req) & 137 CRYPTO_TFM_REQ_MAY_SLEEP, 138 areq_ctx->complete, req); 139 140 err = crypto_ahash_finup(ahreq); 141 if (err) 142 goto out; 143 144 scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg, 145 areq_ctx->cryptlen, 146 crypto_aead_authsize(authenc), 1); 147 148 out: 149 authenc_request_complete(req, err); 150 } 151 152 static void authenc_geniv_ahash_done(struct crypto_async_request *areq, int err) 153 { 154 struct aead_request *req = areq->data; 155 struct crypto_aead *authenc = crypto_aead_reqtfm(req); 156 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); 157 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); 158 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); 159 160 if (err) 161 goto out; 162 163 scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg, 164 areq_ctx->cryptlen, 165 crypto_aead_authsize(authenc), 1); 166 167 out: 168 aead_request_complete(req, err); 169 } 170 171 static void authenc_verify_ahash_update_done(struct crypto_async_request *areq, 172 int err) 173 { 174 u8 *ihash; 175 unsigned int authsize; 176 struct ablkcipher_request *abreq; 177 struct aead_request *req = areq->data; 178 struct crypto_aead *authenc = crypto_aead_reqtfm(req); 179 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); 180 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); 181 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); 182 unsigned int cryptlen = req->cryptlen; 183 184 if (err) 185 goto out; 186 187 ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result, 188 areq_ctx->cryptlen); 189 ahash_request_set_callback(ahreq, aead_request_flags(req) & 190 CRYPTO_TFM_REQ_MAY_SLEEP, 191 areq_ctx->complete, req); 192 193 err = crypto_ahash_finup(ahreq); 194 if (err) 195 goto out; 196 197 authsize = crypto_aead_authsize(authenc); 198 cryptlen -= authsize; 199 ihash = ahreq->result + authsize; 200 scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, 201 authsize, 0); 202 203 err = crypto_memneq(ihash, ahreq->result, authsize) ? -EBADMSG : 0; 204 if (err) 205 goto out; 206 207 abreq = aead_request_ctx(req); 208 ablkcipher_request_set_tfm(abreq, ctx->enc); 209 ablkcipher_request_set_callback(abreq, aead_request_flags(req), 210 req->base.complete, req->base.data); 211 ablkcipher_request_set_crypt(abreq, req->src, req->dst, 212 cryptlen, req->iv); 213 214 err = crypto_ablkcipher_decrypt(abreq); 215 216 out: 217 authenc_request_complete(req, err); 218 } 219 220 static void authenc_verify_ahash_done(struct crypto_async_request *areq, 221 int err) 222 { 223 u8 *ihash; 224 unsigned int authsize; 225 struct ablkcipher_request *abreq; 226 struct aead_request *req = areq->data; 227 struct crypto_aead *authenc = crypto_aead_reqtfm(req); 228 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); 229 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); 230 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); 231 unsigned int cryptlen = req->cryptlen; 232 233 if (err) 234 goto out; 235 236 authsize = crypto_aead_authsize(authenc); 237 cryptlen -= authsize; 238 ihash = ahreq->result + authsize; 239 scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, 240 authsize, 0); 241 242 err = crypto_memneq(ihash, ahreq->result, authsize) ? -EBADMSG : 0; 243 if (err) 244 goto out; 245 246 abreq = aead_request_ctx(req); 247 ablkcipher_request_set_tfm(abreq, ctx->enc); 248 ablkcipher_request_set_callback(abreq, aead_request_flags(req), 249 req->base.complete, req->base.data); 250 ablkcipher_request_set_crypt(abreq, req->src, req->dst, 251 cryptlen, req->iv); 252 253 err = crypto_ablkcipher_decrypt(abreq); 254 255 out: 256 authenc_request_complete(req, err); 257 } 258 259 static u8 *crypto_authenc_ahash_fb(struct aead_request *req, unsigned int flags) 260 { 261 struct crypto_aead *authenc = crypto_aead_reqtfm(req); 262 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); 263 struct crypto_ahash *auth = ctx->auth; 264 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); 265 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); 266 u8 *hash = areq_ctx->tail; 267 int err; 268 269 hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth), 270 crypto_ahash_alignmask(auth) + 1); 271 272 ahash_request_set_tfm(ahreq, auth); 273 274 err = crypto_ahash_init(ahreq); 275 if (err) 276 return ERR_PTR(err); 277 278 ahash_request_set_crypt(ahreq, req->assoc, hash, req->assoclen); 279 ahash_request_set_callback(ahreq, aead_request_flags(req) & flags, 280 areq_ctx->update_complete, req); 281 282 err = crypto_ahash_update(ahreq); 283 if (err) 284 return ERR_PTR(err); 285 286 ahash_request_set_crypt(ahreq, areq_ctx->sg, hash, 287 areq_ctx->cryptlen); 288 ahash_request_set_callback(ahreq, aead_request_flags(req) & flags, 289 areq_ctx->complete, req); 290 291 err = crypto_ahash_finup(ahreq); 292 if (err) 293 return ERR_PTR(err); 294 295 return hash; 296 } 297 298 static u8 *crypto_authenc_ahash(struct aead_request *req, unsigned int flags) 299 { 300 struct crypto_aead *authenc = crypto_aead_reqtfm(req); 301 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); 302 struct crypto_ahash *auth = ctx->auth; 303 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); 304 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); 305 u8 *hash = areq_ctx->tail; 306 int err; 307 308 hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth), 309 crypto_ahash_alignmask(auth) + 1); 310 311 ahash_request_set_tfm(ahreq, auth); 312 ahash_request_set_crypt(ahreq, areq_ctx->sg, hash, 313 areq_ctx->cryptlen); 314 ahash_request_set_callback(ahreq, aead_request_flags(req) & flags, 315 areq_ctx->complete, req); 316 317 err = crypto_ahash_digest(ahreq); 318 if (err) 319 return ERR_PTR(err); 320 321 return hash; 322 } 323 324 static int crypto_authenc_genicv(struct aead_request *req, u8 *iv, 325 unsigned int flags) 326 { 327 struct crypto_aead *authenc = crypto_aead_reqtfm(req); 328 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); 329 struct scatterlist *dst = req->dst; 330 struct scatterlist *assoc = req->assoc; 331 struct scatterlist *cipher = areq_ctx->cipher; 332 struct scatterlist *asg = areq_ctx->asg; 333 unsigned int ivsize = crypto_aead_ivsize(authenc); 334 unsigned int cryptlen = req->cryptlen; 335 authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb; 336 struct page *dstp; 337 u8 *vdst; 338 u8 *hash; 339 340 dstp = sg_page(dst); 341 vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset; 342 343 if (ivsize) { 344 sg_init_table(cipher, 2); 345 sg_set_buf(cipher, iv, ivsize); 346 scatterwalk_crypto_chain(cipher, dst, vdst == iv + ivsize, 2); 347 dst = cipher; 348 cryptlen += ivsize; 349 } 350 351 if (req->assoclen && sg_is_last(assoc)) { 352 authenc_ahash_fn = crypto_authenc_ahash; 353 sg_init_table(asg, 2); 354 sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset); 355 scatterwalk_crypto_chain(asg, dst, 0, 2); 356 dst = asg; 357 cryptlen += req->assoclen; 358 } 359 360 areq_ctx->cryptlen = cryptlen; 361 areq_ctx->sg = dst; 362 363 areq_ctx->complete = authenc_geniv_ahash_done; 364 areq_ctx->update_complete = authenc_geniv_ahash_update_done; 365 366 hash = authenc_ahash_fn(req, flags); 367 if (IS_ERR(hash)) 368 return PTR_ERR(hash); 369 370 scatterwalk_map_and_copy(hash, dst, cryptlen, 371 crypto_aead_authsize(authenc), 1); 372 return 0; 373 } 374 375 static void crypto_authenc_encrypt_done(struct crypto_async_request *req, 376 int err) 377 { 378 struct aead_request *areq = req->data; 379 380 if (!err) { 381 struct crypto_aead *authenc = crypto_aead_reqtfm(areq); 382 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); 383 struct authenc_request_ctx *areq_ctx = aead_request_ctx(areq); 384 struct ablkcipher_request *abreq = (void *)(areq_ctx->tail 385 + ctx->reqoff); 386 u8 *iv = (u8 *)abreq - crypto_ablkcipher_ivsize(ctx->enc); 387 388 err = crypto_authenc_genicv(areq, iv, 0); 389 } 390 391 authenc_request_complete(areq, err); 392 } 393 394 static int crypto_authenc_encrypt(struct aead_request *req) 395 { 396 struct crypto_aead *authenc = crypto_aead_reqtfm(req); 397 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); 398 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); 399 struct crypto_ablkcipher *enc = ctx->enc; 400 struct scatterlist *dst = req->dst; 401 unsigned int cryptlen = req->cryptlen; 402 struct ablkcipher_request *abreq = (void *)(areq_ctx->tail 403 + ctx->reqoff); 404 u8 *iv = (u8 *)abreq - crypto_ablkcipher_ivsize(enc); 405 int err; 406 407 ablkcipher_request_set_tfm(abreq, enc); 408 ablkcipher_request_set_callback(abreq, aead_request_flags(req), 409 crypto_authenc_encrypt_done, req); 410 ablkcipher_request_set_crypt(abreq, req->src, dst, cryptlen, req->iv); 411 412 memcpy(iv, req->iv, crypto_aead_ivsize(authenc)); 413 414 err = crypto_ablkcipher_encrypt(abreq); 415 if (err) 416 return err; 417 418 return crypto_authenc_genicv(req, iv, CRYPTO_TFM_REQ_MAY_SLEEP); 419 } 420 421 static void crypto_authenc_givencrypt_done(struct crypto_async_request *req, 422 int err) 423 { 424 struct aead_request *areq = req->data; 425 426 if (!err) { 427 struct skcipher_givcrypt_request *greq = aead_request_ctx(areq); 428 429 err = crypto_authenc_genicv(areq, greq->giv, 0); 430 } 431 432 authenc_request_complete(areq, err); 433 } 434 435 static int crypto_authenc_givencrypt(struct aead_givcrypt_request *req) 436 { 437 struct crypto_aead *authenc = aead_givcrypt_reqtfm(req); 438 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); 439 struct aead_request *areq = &req->areq; 440 struct skcipher_givcrypt_request *greq = aead_request_ctx(areq); 441 u8 *iv = req->giv; 442 int err; 443 444 skcipher_givcrypt_set_tfm(greq, ctx->enc); 445 skcipher_givcrypt_set_callback(greq, aead_request_flags(areq), 446 crypto_authenc_givencrypt_done, areq); 447 skcipher_givcrypt_set_crypt(greq, areq->src, areq->dst, areq->cryptlen, 448 areq->iv); 449 skcipher_givcrypt_set_giv(greq, iv, req->seq); 450 451 err = crypto_skcipher_givencrypt(greq); 452 if (err) 453 return err; 454 455 return crypto_authenc_genicv(areq, iv, CRYPTO_TFM_REQ_MAY_SLEEP); 456 } 457 458 static int crypto_authenc_verify(struct aead_request *req, 459 authenc_ahash_t authenc_ahash_fn) 460 { 461 struct crypto_aead *authenc = crypto_aead_reqtfm(req); 462 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); 463 u8 *ohash; 464 u8 *ihash; 465 unsigned int authsize; 466 467 areq_ctx->complete = authenc_verify_ahash_done; 468 areq_ctx->update_complete = authenc_verify_ahash_update_done; 469 470 ohash = authenc_ahash_fn(req, CRYPTO_TFM_REQ_MAY_SLEEP); 471 if (IS_ERR(ohash)) 472 return PTR_ERR(ohash); 473 474 authsize = crypto_aead_authsize(authenc); 475 ihash = ohash + authsize; 476 scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, 477 authsize, 0); 478 return crypto_memneq(ihash, ohash, authsize) ? -EBADMSG : 0; 479 } 480 481 static int crypto_authenc_iverify(struct aead_request *req, u8 *iv, 482 unsigned int cryptlen) 483 { 484 struct crypto_aead *authenc = crypto_aead_reqtfm(req); 485 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); 486 struct scatterlist *src = req->src; 487 struct scatterlist *assoc = req->assoc; 488 struct scatterlist *cipher = areq_ctx->cipher; 489 struct scatterlist *asg = areq_ctx->asg; 490 unsigned int ivsize = crypto_aead_ivsize(authenc); 491 authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb; 492 struct page *srcp; 493 u8 *vsrc; 494 495 srcp = sg_page(src); 496 vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset; 497 498 if (ivsize) { 499 sg_init_table(cipher, 2); 500 sg_set_buf(cipher, iv, ivsize); 501 scatterwalk_crypto_chain(cipher, src, vsrc == iv + ivsize, 2); 502 src = cipher; 503 cryptlen += ivsize; 504 } 505 506 if (req->assoclen && sg_is_last(assoc)) { 507 authenc_ahash_fn = crypto_authenc_ahash; 508 sg_init_table(asg, 2); 509 sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset); 510 scatterwalk_crypto_chain(asg, src, 0, 2); 511 src = asg; 512 cryptlen += req->assoclen; 513 } 514 515 areq_ctx->cryptlen = cryptlen; 516 areq_ctx->sg = src; 517 518 return crypto_authenc_verify(req, authenc_ahash_fn); 519 } 520 521 static int crypto_authenc_decrypt(struct aead_request *req) 522 { 523 struct crypto_aead *authenc = crypto_aead_reqtfm(req); 524 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); 525 struct ablkcipher_request *abreq = aead_request_ctx(req); 526 unsigned int cryptlen = req->cryptlen; 527 unsigned int authsize = crypto_aead_authsize(authenc); 528 u8 *iv = req->iv; 529 int err; 530 531 if (cryptlen < authsize) 532 return -EINVAL; 533 cryptlen -= authsize; 534 535 err = crypto_authenc_iverify(req, iv, cryptlen); 536 if (err) 537 return err; 538 539 ablkcipher_request_set_tfm(abreq, ctx->enc); 540 ablkcipher_request_set_callback(abreq, aead_request_flags(req), 541 req->base.complete, req->base.data); 542 ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen, iv); 543 544 return crypto_ablkcipher_decrypt(abreq); 545 } 546 547 static int crypto_authenc_init_tfm(struct crypto_tfm *tfm) 548 { 549 struct crypto_instance *inst = crypto_tfm_alg_instance(tfm); 550 struct authenc_instance_ctx *ictx = crypto_instance_ctx(inst); 551 struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm); 552 struct crypto_ahash *auth; 553 struct crypto_ablkcipher *enc; 554 int err; 555 556 auth = crypto_spawn_ahash(&ictx->auth); 557 if (IS_ERR(auth)) 558 return PTR_ERR(auth); 559 560 enc = crypto_spawn_skcipher(&ictx->enc); 561 err = PTR_ERR(enc); 562 if (IS_ERR(enc)) 563 goto err_free_ahash; 564 565 ctx->auth = auth; 566 ctx->enc = enc; 567 568 ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth) + 569 crypto_ahash_alignmask(auth), 570 crypto_ahash_alignmask(auth) + 1) + 571 crypto_ablkcipher_ivsize(enc); 572 573 crypto_aead_set_reqsize(__crypto_aead_cast(tfm), 574 sizeof(struct authenc_request_ctx) + 575 ctx->reqoff + 576 max_t(unsigned int, 577 crypto_ahash_reqsize(auth) + 578 sizeof(struct ahash_request), 579 sizeof(struct skcipher_givcrypt_request) + 580 crypto_ablkcipher_reqsize(enc))); 581 582 return 0; 583 584 err_free_ahash: 585 crypto_free_ahash(auth); 586 return err; 587 } 588 589 static void crypto_authenc_exit_tfm(struct crypto_tfm *tfm) 590 { 591 struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm); 592 593 crypto_free_ahash(ctx->auth); 594 crypto_free_ablkcipher(ctx->enc); 595 } 596 597 static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb) 598 { 599 struct crypto_attr_type *algt; 600 struct crypto_instance *inst; 601 struct hash_alg_common *auth; 602 struct crypto_alg *auth_base; 603 struct crypto_alg *enc; 604 struct authenc_instance_ctx *ctx; 605 const char *enc_name; 606 int err; 607 608 algt = crypto_get_attr_type(tb); 609 if (IS_ERR(algt)) 610 return ERR_CAST(algt); 611 612 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) 613 return ERR_PTR(-EINVAL); 614 615 auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH, 616 CRYPTO_ALG_TYPE_AHASH_MASK); 617 if (IS_ERR(auth)) 618 return ERR_CAST(auth); 619 620 auth_base = &auth->base; 621 622 enc_name = crypto_attr_alg_name(tb[2]); 623 err = PTR_ERR(enc_name); 624 if (IS_ERR(enc_name)) 625 goto out_put_auth; 626 627 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); 628 err = -ENOMEM; 629 if (!inst) 630 goto out_put_auth; 631 632 ctx = crypto_instance_ctx(inst); 633 634 err = crypto_init_ahash_spawn(&ctx->auth, auth, inst); 635 if (err) 636 goto err_free_inst; 637 638 crypto_set_skcipher_spawn(&ctx->enc, inst); 639 err = crypto_grab_skcipher(&ctx->enc, enc_name, 0, 640 crypto_requires_sync(algt->type, 641 algt->mask)); 642 if (err) 643 goto err_drop_auth; 644 645 enc = crypto_skcipher_spawn_alg(&ctx->enc); 646 647 err = -ENAMETOOLONG; 648 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, 649 "authenc(%s,%s)", auth_base->cra_name, enc->cra_name) >= 650 CRYPTO_MAX_ALG_NAME) 651 goto err_drop_enc; 652 653 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, 654 "authenc(%s,%s)", auth_base->cra_driver_name, 655 enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) 656 goto err_drop_enc; 657 658 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD; 659 inst->alg.cra_flags |= enc->cra_flags & CRYPTO_ALG_ASYNC; 660 inst->alg.cra_priority = enc->cra_priority * 661 10 + auth_base->cra_priority; 662 inst->alg.cra_blocksize = enc->cra_blocksize; 663 inst->alg.cra_alignmask = auth_base->cra_alignmask | enc->cra_alignmask; 664 inst->alg.cra_type = &crypto_aead_type; 665 666 inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize; 667 inst->alg.cra_aead.maxauthsize = auth->digestsize; 668 669 inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_ctx); 670 671 inst->alg.cra_init = crypto_authenc_init_tfm; 672 inst->alg.cra_exit = crypto_authenc_exit_tfm; 673 674 inst->alg.cra_aead.setkey = crypto_authenc_setkey; 675 inst->alg.cra_aead.encrypt = crypto_authenc_encrypt; 676 inst->alg.cra_aead.decrypt = crypto_authenc_decrypt; 677 inst->alg.cra_aead.givencrypt = crypto_authenc_givencrypt; 678 679 out: 680 crypto_mod_put(auth_base); 681 return inst; 682 683 err_drop_enc: 684 crypto_drop_skcipher(&ctx->enc); 685 err_drop_auth: 686 crypto_drop_ahash(&ctx->auth); 687 err_free_inst: 688 kfree(inst); 689 out_put_auth: 690 inst = ERR_PTR(err); 691 goto out; 692 } 693 694 static void crypto_authenc_free(struct crypto_instance *inst) 695 { 696 struct authenc_instance_ctx *ctx = crypto_instance_ctx(inst); 697 698 crypto_drop_skcipher(&ctx->enc); 699 crypto_drop_ahash(&ctx->auth); 700 kfree(inst); 701 } 702 703 static struct crypto_template crypto_authenc_tmpl = { 704 .name = "authenc", 705 .alloc = crypto_authenc_alloc, 706 .free = crypto_authenc_free, 707 .module = THIS_MODULE, 708 }; 709 710 static int __init crypto_authenc_module_init(void) 711 { 712 return crypto_register_template(&crypto_authenc_tmpl); 713 } 714 715 static void __exit crypto_authenc_module_exit(void) 716 { 717 crypto_unregister_template(&crypto_authenc_tmpl); 718 } 719 720 module_init(crypto_authenc_module_init); 721 module_exit(crypto_authenc_module_exit); 722 723 MODULE_LICENSE("GPL"); 724 MODULE_DESCRIPTION("Simple AEAD wrapper for IPsec"); 725 MODULE_ALIAS_CRYPTO("authenc"); 726